package com.aoyi.popwindow_donghua;

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AnimationUtils;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private PopupWindow popupWindow;
    private TextView tv_tanchu;
    private View view;
    private RelativeLayout layout_zong;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_tanchu = (TextView) findViewById(R.id.tv_tanchu);
        layout_zong = (RelativeLayout) findViewById(R.id.layout_zong);

        tv_tanchu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = layoutInflater.inflate(R.layout.pop, null);
                //给popwindow加上动画效果
                LinearLayout layout_pop = (LinearLayout) view.findViewById(R.id.layout_pop);
                view.startAnimation(AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_in));
                layout_pop.startAnimation(AnimationUtils.loadAnimation(getApplicationContext(), R.anim.push_bottom_in));
                //设置popwindow的宽高，这里我直接获取了手机屏幕的宽，高设置了600DP
                DisplayMetrics dm = new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(dm);
                popupWindow = new PopupWindow(view, dm.widthPixels, 600);

// 使其聚集
                popupWindow.setFocusable(true);
                // 设置允许在外点击消失
                popupWindow.setOutsideTouchable(true);

                // 这个是为了点击“返回Back”也能使其消失，并且并不会影响你的背景
                popupWindow.setBackgroundDrawable(new BitmapDrawable());
                backgroundAlpha(120f);  //透明度
                popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
                    @Override
                    public void onDismiss() {
                        backgroundAlpha(1f);

                    }
                });
                //弹出的位置
                WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
                popupWindow.showAtLocation(layout_zong, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);
            }
        });
    }

    /**
     * 设置添加屏幕的背景透明度
     *
     * @param bgAlpha
     */
    public void backgroundAlpha(float bgAlpha) {
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.alpha = bgAlpha; //0.0-1.0
        getWindow().setAttributes(lp);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="400"
    android:fromAlpha="0.0"
    android:toAlpha="1.0" />

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="400"
    android:fromYDelta="100%"
    android:interpolator="@android:anim/decelerate_interpolator"
    android:toYDelta="0" />

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#ffffff"
    android:id="@+id/layout_pop"
    android:layout_height="match_parent">
<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:textSize="18sp"
    android:gravity="center"
    android:text="Hello world"/>
</LinearLayout>